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I would much rather have Titanium, a material that actually will last a lifetime. It's a shame that more builders don't use it. Price and weight are comparable to titanium and the life cycle is 100 times that of carbon.

I'm on my third set of XTR trails in less than 2 years and just had the caliper replaced under warranty on that set. 2 blown master cylinders on the first two sets. Shimano brakes just aren't that reliable.